JP3297909B2 - Inspection method of bonding condition of impermeable sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a bonded state of a water-impervious sheet laid on a waste landfill site so that wastewater generated from the waste leaks.

[0002]

2. Description of the Related Art In a landfill type waste disposal site for dumping industrial waste and general waste, the bottom of the disposal site is to be prevented in order to prevent environmental pollution due to sewage leaking from the disposal site penetrating underground. It is obliged to provide waterproofing work for As such water-blocking work, a method of laying a soft synthetic resin-based or rubber-based water-blocking sheet is adopted from the viewpoints of reliability, safety, workability, and the like. When laying, it is common to lay a band-shaped impermeable sheet having a width of about 2 m while overlapping and adhering at the peripheral edge thereof.

[0003]

If there is an insufficient portion for joining the water-impervious sheets, sewage will leak from the portion, so that the bonding operation and the inspection thereof must be performed particularly carefully. However, since the impermeable sheet used so far is formed of non-translucent synthetic resin or rubber,
It is not possible to grasp the joint state from the appearance. For this reason, expensive machines are introduced to check for any defective joints, and checks are performed one by one while pulling by hand. In such a conventional inspection method,
Even if it is determined that there is a defective portion, the location cannot be immediately specified, and the operation by hand is extremely complicated. Therefore, an object of the present invention is to provide an inspection method that can improve the reliability of bonding and that can accurately detect a defective bonding portion.

[0004] In order to achieve the above object, the present invention is a method for inspecting the bonding state of a water-impervious sheet laid at a landfill site for waste, wherein the peripheral parts of adjacent water-impervious sheets are overlapped with each other, At least two or more adhesive portions are provided in parallel at the overlapping portion, and at least one of the water-impervious sheets to be overlapped has a light-transmitting portion at the overlapping portion, and the adhesive portion and the adhesive portion are used. A colored liquid is caused to flow into the bag-like portion sandwiched between the sheets, and a defective joint portion can be visually confirmed from the outside.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for bonding a water-impervious sheet and a method for inspecting a bonding state according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows the impermeable sheet,
FIG. 2 is an explanatory view showing a superimposed portion of the impermeable sheet, and FIG.
Is a sectional view taken along line AA. The water-blocking sheet 1 is made of a soft olefin-based synthetic resin having a light-transmitting property and excellent water-blocking properties, and has a width of 2.03 m. Of these, the peripheral portion 50 mm is the overlapping portion 2.

[0006] The impermeable sheet 1, 1 ·
・ By joining together, they are integrated and laid at the bottom of the waste disposal site. Regarding the joining method, first, moisture and oil in the overlapping portion 2 of the impermeable sheet 1 are dropped with a rag or the like, and then the portions 2 and 2 are overlapped and thermally fused by a hot iron welding machine (not shown). The hot trowel welding machine has two rows of hot wedges and pressure rollers, and adjusts them so that they can be fused together with a width of 15 mm and a width of 15 mm. Then, the portions 2 and 2 are sandwiched between the two hot wedges from the edges thereof, and are advanced while being fused by a hot iron and hot air. Then, as shown in FIG. 3, the bonding portions 3 and 3 having a width of 15 mm and the test channel 4 having a width of 15 mm also.
Are formed. This is repeated until the bottom of the waste disposal site is completely covered with the impermeable sheets 1, 1,....

Next, in order to check whether or not the bonding state of the impermeable sheets 1, 1,... Is normal, a colored liquid 5 is caused to flow into the test channel 4 by a press or the like. Then, the colored liquid 5 leaks out of the poor joint portion 6, but since the water-blocking sheet 1 is a light-transmitting resin, it can be visually confirmed from the outside (see FIG. 4). If a defective joint 6 is found, the liquid 5 may be drained with a decompressor or the like to take measures.

By the way, the impermeable sheet may be deteriorated or damaged by a sharp substance in the waste, a strong impact when the waste is dumped, a chemical substance leaking from the waste, ultraviolet rays, or the like. To prevent this,
After it has been confirmed that all of the impermeable sheets 1, 1, ... have been successfully joined, a method of laminating protective sheets 7, 7, ... on the upper surface of the impermeable sheets 1, 1, ... has been known. I have.
Since the protective sheet 7 is laminated with a protective material having excellent impact resistance and chemical resistance, even if the waterproof sheet 1 is made to have a light-transmitting property, the protective sheet 7 does not deteriorate. Plays a supplementary role.

By employing the above embodiment, it is possible to easily and inexpensively check for defective joints without using a large-scale apparatus or inspection method, and visually check defective joints 6, 6,... Since it is clearly identifiable, it is possible to promptly cope with a bonding defect / deficiency.

[0010] The water impermeable sheet of the present invention is not limited to the above-described embodiment, but departs from the gist of the present invention, such as the material, shape and size of the water impermeable sheet, the bonding means, and the flowing liquid. It can be changed appropriately within a range not to be performed. For example, the water-impervious sheet may be made of a rubber-based material, or the part having translucency may be part or whole, and carbon is mixed into a part other than the overlapping part for reinforcement. May be used. Further, in the present embodiment, a method using a hot trowel welding machine for joining the impermeable sheets has been described. However, the joining method is not particularly limited thereto, and for example, a method using an adhesive is also conceivable. Any liquid may be used as long as it does not degrade the impermeable sheet. However, it is preferable to use a highly volatile liquid because it evaporates faster after draining.

[0011]

According to the present invention, since a plurality of adhesive portions are provided, even if one of the adhesive portions has a defective joint, the other sheet retains the water-impermeability, thereby improving the reliability of the water-impervious sheet. Can be enhanced. In addition, it is possible to check in a simple manner whether or not the bonding state of the impermeable sheet is normal, and it is possible to visually identify a bonding failure portion, so that a large-scale device and a complicated inspection process are not required, Can deal quickly with low cost. As a result, highly reliable water shielding work can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a water impermeable sheet.

FIG. 2 is an explanatory view showing a joint portion of a water-impervious sheet.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an explanatory view showing a method of inspecting a bonding state.

FIG. 5 is an explanatory diagram showing an example of a water shielding work at a waste disposal site using a water shielding sheet.

[Explanation of symbols]

1 .... water-blocking sheet, 2 .... overlapping part, 3 .... bonding part, 4 .... bag-shaped part (test channel), 5 .... colored liquid, 6 .... defective joint part, 7 .... protective sheet .

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-80452 (JP, A) JP-A-61-282 (JP, A) JP-A-63-182134 (JP, A) 107199 (JP, U) JP 5-68566 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B09B 1/00 B29C 65/00-65/82 E02B 3/12- 3/18 E02D 3/00 102 G01M 3/00-3/40

Claims (1)

(57) [Claims] 1. A method for inspecting a joined state of a water impermeable sheet laid at a landfill site of waste, comprising:
At least two or more adhesive portions are provided in parallel at the overlapping portion, and at least one of the water-impervious sheets to be overlapped has a light-transmitting portion at the overlapping portion, and the adhesive portion and the adhesive portion are used. A method for inspecting the joint state of a water-impervious sheet, in which a colored liquid flows into a bag-like portion sandwiched between the sheets, and a defective joint portion can be visually confirmed from the outside.